Blowpipe



June 9, 1931. J. E. VINCENT BLOWPIPE Filed March l. 1929 Patented June9,' A1931 i Jaime E. vINoEN'r, or JOHNs'rowN, rnimsnvaiiia BDOWPIPEApplication led March 1,

This invention relates to blowpipes such as are employed inthe art ofcutting with gases,

and more particularly to a blowpipe which is j especially adapted forthe eioient combustion and use of natural gas at the standard lowpressure at which natural gas is commercially furnished. y

Heretofore, with blowpipes of the class to which this invention'belongs,it has been necessary to materially boost the pressure of natural gas inorder to use such gas, thus entailing extra expense and labor. Theblowpipe of the present invention is designed to use natural as at thestandard commercial pressure of om eight to nine ounces.

Another and important object is to provide an integral key for lockinthe inner and outer tips againstV rotation, this feature having the dualadvantage of bei-n an integral part of the tip and therefore ed a ainstmisplacement, and also bein an integra part of the tip it is formed of te same metal as the tip and has the same rate of expansion andcontraction as the tip and, therefore, will lnot bind.

In the drawings: Y Figure 1 is a vertical sectional view through thehead and top of a blowpipe embodying my invention.

Figure 2 is a side'v elevation of the inner tipFmember.

igure 3 is a transverse section taken on the line III-III of Figure 1. v

Figure 4 is a transverse section taken on the line IV-IV of Figure 1.

Referring more particularly to the drawings, the numeral 1 desi ates thehead of the blowpipe, neck 2 having in the upper portion thereof abranched passageway 3 communicating at its forward end with a chamber`4, an upwardly inclined passageway 5 and a second upwardly inclinedpassageway 6. Communi- 45 eating with the rear or receiving ends of theand 9 which serve to conduct cutting oxygen, preheating oxygen, andcombustible gas, respectively, thereto. -The upper end ofthe passageway5 communicates with a chamber 10 formed by a bore extending downwardlysaid head being provided with a gr passageways 3, 5 and 6 are the pipes7, 8

192s. serial No. 343,647.

and forwardly into said head and having lthreaded therein the body 11 ofan injector,

the saidinjector having a stem 12 mounted in said chamber and anoperating head 13, there being packing 14 interposed between 55 `saidhead and seat 15 on top of the head.

This injector is provided with a central bore 1 6, the upper end ofvwhich communicates by lateral ports 17 with the chamber 10.. The lowerend of the injector is adapted to discharge centrally into an inclinedpassageway 18 which in turn discharges into an annular chamber 19provided in the lower portion of the blowpipe head and surrounding theinner tip member, to be described hereinafter. The passageway 6discharges into a chamber 20 surrounding the lower end of the saidinjector and communicating` with the passageway 18. 'Extendingdownwardly from the chamber 4 is a short passageway 21, which merges 70with an enlarged threaded bore 22 extending tothe chamber 19.

lThreaded into the said bore 22 is an inner tip member, indicatedgenerally at 23. This member comprises 4an upper threaded por- 75 tiony24 cooperating with the thread in the bore 22 and is provided with arounded head 25 adapted to seat against the rounded upr end of saidbore.

The tip 23 is cut away intermediate its 80 ends to provide a portion 36of reduced diameter which cooperates with the outer tip member 32 toform a mixing chamber 36 of over halffthe length of the outer tip member32. j 85 The inner tip member 23 is provided with a plurality ofrelatively large V-shape'd ooves 27 extending lon 'tu inally from thethreaded portion 24 to t e cut-away portion 36. The grooves 27 are ofsuch size that 90 their cross-sectional area is at least equal t0` halfthe cross-sectional area of the mixing chamber 36. i

The portion 28 of the tip 23 below the mixing chamber 36 is tapered tocorrespond to 95 the tapered nose of the outer tip 32 and is providedwith V-sha d grooves 37 through which the mixture o gases from themixing chamber 36 pass. The inner tip23 is provided with a central bore30 for conducting cut- 1C ting oxygen from the chamber a to the centraloutlet orifice 3l,

The outer tip member 32 fits within the lower end of the head 1 andsurrounds the lower portion of the inner tip member 23. This outer tipmember has a cylindrical upper portion 33 adapted to lit within thelower end of the head and to lit snugly about the cylindrical body ofthe inner tip 28, thus sealing the outer sides of the grooves 2?., Forthe purpose of securing the two members together an integral heyprojection 31E: is provided on the inner surface of the outer member 32and a key-way 35 `is formed in the inner tip member. This manner ofconnecting the inner and outer tip members has proved of great advantagein the quick and eliicient assembling of said members. Also by providingan integral key, there is no chance or" the key becoming lost, and thekey being formed of the same material as the tips the expansion andcontraction of the lrey and hey-way will be the same and, therefore, thekey will not be loosened nor will it bind as is often the case when thekeys are composed of di'erent metals.

It will be noted that the lower end of the outer tip member projectsbeyond the lower end ofthe inner tip member, thereby providing aJfrusto-conical chamber 38. This chamber 38 has been found to be ofbenet in that it provides or the use of gases of high igniting pointwithout danger oiE blowing out the flame through the pressure of theoxygen delivered through the orice 3l, since it shields the preheatingliarne from 'drafts or currents of air induced by the jets and flowinglongitudinally of the blowpipe. Furthermore, this chamber serves topreheat the oxygen, thereby producing a more intense .end of such headand comprising a packing 40 compressed into the joint between such headand tip.

In operation, oxygen 'for preheating purposes and the combustible gashaving been turned on, the oxygen delivered through the injector willthoroughly commingle with the combustible gas in the passageway 18 andthe chamber 19 and will be delivered through the grooves 27 into thechamber 36 where they will be further mixed, and the mixture will thenpass through the grooves 37 into the chamber 38. The metal will bequickly preheated and at a substantially single spot, after whichcutting oxygen will be supplied from the chamber 4 and the passageway 30and will operate to cut or soften the metal.

While I have shown and described one specific embodiment of my inventionit will be understood that I do not wish to be limited thereto, sincevarious modifications may be madeA without departing from the scopethereof, as dened in the appended claim.

Ir claim:

A blow pipe of the character described comprising a head,'a tip carriedby said head and comprising an inner tip member having a centralpassageway for cutting oxygen, an outer tip member surrounding saidinner tip member, said inner tip member having a materially reduceddiameter for more than half of its length within said outer tip memberso as to form a mixing chamber of material size, a plurality of V-shapedOrooves in the portion of said inner tip member above said reduceddiameter portion, the combined cross-sectional area of said V-shapedgrooves being at least half of the cross-sectional area of the spaceformed by said reduced diameter portion and said grooves extending fromabove said outer tip member into said space formed by said reduceddiameter portion, and the lower end of said inner tip member below saidreduced diameter portion being also provided with a plurality ofV-shaped grooves for the passage of the mixture of ases from said mixingchamber, and means or supplying cutting oxygen to the central passagewayin said inner tip and a mixture of preheatin oxygen and a combustiblegas to the V-shape grooves in said inner tip. y

In testimony whereof, I have hereunto set my hand. JAMES E. VINCENT.

